Top 10-15. Sherman is spectacular, has great technique, instincts, and excellent knowledge.
The ability to shut down one side of the field shouldn't be overlooked though. Considering how often offense's prefer fieldside reads and being able to erase the sidelines there is crucial. Thomas over the top was critical, yes, but there's still a lot of ground to cover for a CB with just a single high safety as opposed to two deep shells. Kam was essentially a free defender/lurker more in tune w/ Seattle's Under Front and was not used as a typical deep safety in those respects.

Guessing it happened in Castlewood Canyon park. I used to go hiking there a lot and there are some steep drop offs and narrow trails. Stepped on a thin layer of snow once that thinly veiled an ice patch, nearly slipped into the canyon if not for being able to grab onto a small tree growing on the edge of the pathway. Thank goodness Mccaffrey was at the right place at the right time to help this gentlemen.

I can't imagine the NFL creating an additional program that competes with it's seasonal revenue, practice squad players, or lower level assistants that would all be available for coaching during the off season. A spring D-league makes the most sense in that regard

A D-league needs to happen and it being held in the offseason for continued player development would do nothing to detract from the NFL and would in turn help their final product. Too much talent is placed by the wayside, and too much quality is lost due to the inevitable and numerous injuries that happen throughout the course of an NFL season.
NFL needs to get it done.